The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 25, 2005
Filed:
Oct. 28, 1999
Arthur Perry Berkhoff, The Hague, NL;
Michiel Wilbert Rombout Maria Van Overbeek, Dordrecht, NL;
Nicolaas Jan Doelman, Delft, NL;
Arthur Perry Berkhoff, The Hague, NL;
Michiel Wilbert Rombout Maria Van Overbeek, Dordrecht, NL;
Nicolaas Jan Doelman, Delft, NL;
Abstract
Noise reduction arrangement including: a plurality of actuators (()) for generating secondary noise (p) to reduce primary noise (p) and being located in a first surface; a plurality of errors sensors (()) located in a second surface parallel to the first surface for sensing a total amount of noise resulting from the primary noise after being reduced by the secondary noise; a plurality of control elements (()) for controlling the actuators (()) based on the sensor outputs, wherein the distance (d) between the first and second surfaces is such that reduction in power RP of the total amount of noise relative to the primary noise within a predetermined frequency band is within the following range: 0.9×RP≦RP≦RPin which RPis the maximum obtainable reduction in power of the total amount of noise relative to the primary noise, both RP and RPbeing expressed in decibel.